What is the value of specific rotation exhibited by glucose molecule?

Which of the following carbohydrates cannot reduce Tollen's reagent?

Which of the following molecules represents the $D$-form?

$A$ certain compound gives a negative test with ninhydrin and a positive test with Benedict's solution. The compound is:

$(i) \ CHO-(CHOH)_3-CH_2OH \xrightarrow{4HIO_4} \text{Product}$
$(ii) \ CH_2OH-(CHOH)_4-CH_2OH \xrightarrow{5HIO_4} \text{Product}$
\text{The ratio of moles of formic acid obtained in reaction } $(i)$ \text{ and reaction } (ii) \text{ is:}

Compound $A$ gives $D$-Galactose and $D$-Glucose on hydrolysis. The compound $A$ is: